Mufflers



H. EWASHUK Oct. 10, 1961 MUFFLERS Filed April 14, 1959 IN V EV TOR.

MIR) ELVIS/70A nez/my Harry Ewashnk, 12228 88th St, Edmonton, Albe Canada Filed Apr. 14, 1959, Ser. No. 806,300 1 Claim. (Cl. 181-53) This invention relates to muffler structures as used in connection with combustion engines in the automotive industry.

A mufller or silencing device at the exhaust of an automobile engine has for its purpose to reduce the noise of the exhaust. The silencing action of the muffler of heretofore used muffler devices is usually predicated upon the introduction of various baffling means. The greater silencing effect is required, the more bafiles have to be employed. Reversely, the more battles are employed, the greater is the back pressure against the engine operation, resulting in the lessening of the effective horsepower of the engine.

Furthermore, mufflers of the heretofore used type are not only complex but their cost is relatively high. In addition they are usually bulky. That bulkiness not only makes their installation ditlicult, but also renders the mufller vulnerable to damage by impediments on the road.

The principal objects of the present invention are to overcome the structural disadvantages and the high cost of present-day mufllers, to provide an eflicient muffler of simple construction without baffles of any kind and which will nevertheless provide proper silencing of the exhaust gases without materially reducing engine power, and wherein a substantial reduction in size is effected and wherein its shape is such as to facilitate ready mounting of the mufller in places within the frame of a vehicle to assure safety for the muffler from damage caused by obstructions on the road.

The foregoing and additional important objects and advantages of the present invention will be more clearly understood from reading the ensuing specification in connection with the accompanying drawings, which latter while illustrating a presently preferred embodiment of the present invention are by no means intended to limit the latter in any way and are to. serve for explanatory purposes only.

In the drawings:

FIG. 1 is a plan view of the mutller according to the present invention; and

FIG. 2 is a section taken. approximately along lines 22 of FIG. 1.

As will be noted from both figures, the present muffler structure is of very simple construction and essentially comprises only six joined parts which are integrated with one another. It will be also noted that there are no battles present anywheres within the device.

The aforementioned six parts comprising the device consist of two substantially parallel, essentially like tubular members and '11, which are joined with one another by a pair of like, and parallely spaced upp r and lower connecting plates 12 and 13, the end of which plates and the tubes being joined by end plates 14 and 15, each end plate closing one end of each tube, thus end plate 14 closes one end of tube 11 and end plate 15 closes one end of 'tube 10.

Adjacent the closed ends of the tubes there are provided in tube 10 perforations or apertures '16 and in tube 11 perforations or apertures 17, these perforations extending from the closed ends of the tubes toward their open ends 10' and 11', respectively. Longitudinal connecting plates 12 and 13 as well as end plates 14 and 15 are-secured to the tubes by welding or in any other suitable manner to provide tight joints between the different parts of the device, whereby a substantially closed chamber is effected.

As will be seen in FIG. 2, the device is of a relatively.

flat construction which permitsfitting of the mufller into any suitable or available secure place within the frame of a vehicle, to render the muf'fier safe against external damage on the road. Moreover, either of the tubular members or pipes 10 or 11 may serve as intake and'exhaust. For instance pipe 10 may be connected to the exhaust manifold of the engine while pipe 11 is then connected to the exhaust pipe passing beneath the frame to a place at the rear of the vehicle. The fact that either end can be used as either intake or exhaust also greatly facilitates the application of the device to existing vehicles. In operation, the gases issuing from the engine into one pipe of the mufiier, say pipe 10, are passed through perforations '16 of that pipe into the muffler chamber and are directed outwardly through perforations 17 extending from the closed end of the pipe 11 toward its open end, and through that pipe to without. Due to the substantially unrestricted flow of the exhaust gases from one pipe to the other, a, very efiective silencing or muffling of the exhaust gases is effected. That muffling effect of the device depends partly upon the disposition and the number of apertures in either of the two pipes and partly upon the interior volume of the muffler body. It has been found that by increasing either the number of apertures 16 and 17 or increasing their size, various mutliing effects can be efiected. Similarly the spacing of tubular members 10 and 11 will also alter the muflling effect of the device. This of course calls for different widths of connecting plates 12 and 13 and correspondingly shaped end plates 14 and 15.

Obviously the desired mutfling effect for difierent sizes of the engine will vary. A small engine, say a six cylinder motor, may require a narrow and short muflier type, while a wider and longer mufller will 'be necessary for a larger engine. Thus the silencing effect of the exhaust gases may be readily varied by either just the spacing of the two tubular members 10, 11 or by either increasing or decreasing the number of apertures 16 and 17, or by simply varying the sizes of these apertures.

It has been found that inthe use of mufilers of the present invention a very effective silencing of the exhaust gases is achieved, while the engine efficiency, due to back pressure, is affected to a relatively small degree.

While the foregoing explanatory description deals with the simplest form of the present invention, it is obvious that the indicated changes and modifications required in this application of the device to existing vehicles may have to be made, such changes and modifications are deemed to reside within the scope of the prment invention as defined in the annexed claim.

What is claimed as new is:

In a mufiler structure, a pair of spaced, substantially parallel tubular members offset relative to each other so that one end, designated as outer end, of one member extends beyond the other end, designated the inner end, of the other member, a pair of substantially parallel connecting plates joining said members peripherally along spaced parallel diametrically opposite lines extending axially of said members, end plates closing the inner ends Patented Oct. 10, 1961 of the tubular members and being secured to the ends of said connecting plates, whereby a closed chamber is formed defined by the outer surfaces of said tubular members, the connecting plates and the end plates, said tubular members having perforations opening into the interior of the thus formed chamber, said perforations progressing in the direction from the closed ends of the tubular members toward their outer ends but terminating short of the end plates.

UNITED STATES PATENTS Coles Aug. 3, 1909 Nelson Sept. 2, 1958 FOREIGN PATENTS France May Q, 1927 Sweden Jan. 27, 1942 

